Using classic Outlook for Windows in business environments
Hi Sammi,
To help me better understand the situation and provide more suitable guidance, please share a few additional details:
1/ Is this a Microsoft 365 work or school account provided by your organization, or an email account hosted by another email provider?
2/ Are you able to sign in to Outlook on the web using the same email address?
3/ Please also share a screenshot of the error message or behavior you see when attempting to add the account to Outlook. This may help the community better identify the cause of the issue.
I look forward to your response.